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Algorithm, su bitcoin. A b Hileman, Garrick; Rauchs, Michel. «On Friday, Japan's Financial Services Agency officially recognized 11 companies as registered cryptocurrency exchange is is the latest decision in Japan to show support for digital currency. This allows bitcoin software to determine when a particular bitcoin amount has been spent, which is necessary in order to prevent double-spending in an environment without central oversight. Retrieved 2 November 2014. Bitcoin uses public-key cryptography, in which two cryptographic keys, one public and one private, are generated.